Electric glow-lamp



(No Model.)

B. A. COLBY.

ELEGTRIO GLOW LAMP.

No. 558,634. PatentedApr. 21, 1896.

ANDREW B GRAHAM.PHOTOUTHQWASHINGTDN. D C

EDXVARD A. COLBY, OF NEWARK, NEIV JERSEY.

ELECTRIC G LOW-=LAIVI P.

SPECIFICATION forming part of Letters Patent No. 558,634, dated April21, 1896. Application filed May 21, 1894. Serial No. 511,895. on;model.)

.To aZZ whom it may concern:

Be it known that I, EDWARD A. COLBY, of Newark, Essex county, NewJersey, have invented a new and useful Improvement in ElectricGlow-Lamps, of which the following is a specification.

My invention is an improvement upon that form of glow-lamp which is setforth in my Letters Patent Nos. 498,878, 49S,S79,?l98,929, and 499,097,and granted to me on the 0th day of June, 1893. It therefore belongs tothat class of lamps in which a closed conductor, disposed in asubstantially exhausted receiver, is subjected to the inductiveinfluence of the field produced by varying currents in an externalelectric conductor.

My present invention relates to the construction of a lamp whereby anysupports for the inducing-coil are rendered unnecessary, and the coilmay, if desired, be placed directly upon the lamp itself; also in themode of construction of the glass receiver; also in the substitution ofa disk or flat ring of carbon or other suitable material in place of theordinary filament.

I11 the accompanying drawings, Figure .l. is a section of thelamp on theline 1 1 of Fig. 2. Fig. 2 is an outside View showing the inducing-coilpartly broken away and in section. Fig. 3 represents the lamp in sectionwith the inducing-coil removed. Fig. 4 shows the incandescing body inthe form of a fiat ring instead of a disk, as represented in Fig. 1;Fig. 5 is a crosssection of the ring shown in Fig. 4. Fig. 6 shows twoparts of the glass receiver separate and indicates the modes of puttingthem together.

Similar letters of reference indicate like parts.

The glass receiver A is made in two hemispherical parts B and 0, eachprovided with the usual tube at D for exhausting the air therefrom.After these glass hemispheres B and C are made and while hot, the edgesE and F are to be turned in, Fig. 6, thus mak ing inward flanges. Inplace of the ordinar r filament I use a disk G, of carbon, havingoffsets H. These offsets II are placed between the turned-in flanges E Fof the glass receiver, and then, by means of the blowpipe or any othersuitable means, the glass is fused together at the edges of E and F andthe spherical receiver A thus completed. It will be seen from Fig. 3that the disk G is thus held by its projections I-I between the turnedover flanges E and F inside of the receiver. The receiver is thenexhausted through one tube D and is sealed in the usual way.

In certain of my former applications I have shown my lamps with a closedcoil filament contained wholly within the receiver, and I haverepresented said lamps as annular in form, so that they might bedisposed upon the same support 011 which the inducing-coil is held. henthese lamps are so constructed as to require currents of high potentialand high frequency, it is preferable of course not to use iron supportsfor either the lamp or the inducing-coil. The inventions set forth in myformer patents were of course not limited to the use of such ironsupports, but nevertheless I have thought it advisable, in the presentcase, to show my lamp so arranged and constructed as to enable such irosupports to be wholly omitted. l

\V hen the hemispheres B and C are brought togther to form the receiverA, depressions I are formed opposite one another at the point ofjunction of the hemispheres. At this point the lamp is surrounded by theinducing-coil J, which is wound upon any suitable spool K. which enterthe depressions. These pins are secured to a spring-bar M, attached tothe spool K, and this bar is pressed upon by the leaf-spring N, by whichmeans the ends of the pins are forced into the depressions. In this waythe induction-coil J is held in place upon the globe or receiver A. Itwill also be apparent that the carbon disk G is symmetrically disposedin a horizontal plane passing through the middle of the coil J and thatwhen alternating currents are sent through the coil J currents will alsobe induced in and will circulate through the disk G, rendering said diskincandescent, so that it gives forth light-rays on both of its oppositecircular flat surfaces.

In place of using a disk, such as G, I may use a ring 0, Fig. 5, whichis simply the disk G with the central part out. This ring hasprojections I-I similar to those 011 disk G, which projections are heldin like manner between the turned-over parts E and F.

Through the coil pass pins L, the ends of I claim v 1. The combinationin an electric glowlamp of an inducing-coil, a receiver within saidcoil, and Within said receiver and surrounded by said coil a closedconductor in flat circular form having its face disposed in a planeparallel to the face of the coil.

2. The combination in an electric glowlamp of a receiver, a closedconductor wholly inclosed therein, an inducing-coil surrounding andsupported upon said receiver and means for detachably securing said coilin place.

3. The combination in an electric glowlamp of a glass receiver formed oftwo hemispherical portions united at their edges, and a'close'dconductor in ilat circular form Within said receiver and provided withradial projections received between said edges.

4. The combination in an electric glowlamp of a glass receiver, a closedconductor therein, and an inducing-coil; the said receiver havingdiametrically-opposite depressions and the said coil being provided withinternal points entering said depressions.

5. The combination in an electric glowlamp of the glass receiver Aprovided with placing between said flanges the projections 1-1 of theconducting-disk G: fourth, fusing the edges of the hemispheres B 0together to produce a globular receiver A, and, fifth, exhausting saidreceiver.

7. The combination in an electric glowlamp of the glass receiver Aprovided with internal flanges, E and F, and diametricallyopposi'tedepressions I, the conducting-disk G having projections H receivedbetween said flanges and the inducingcoil J supported upon said receiverA and having pins, L, entering said depressions I, substantially asdescribed.

EDVVARD A. COLBY.

Witnesses:

H. R. MOLLER, M. Boson.

